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Description

The BK7 Double Concave Lens (DCV) is a specialized optical component designed to diverge parallel light beams. Similar to the plano concave lens, the double concave lens features a negative focal length, resulting in the dispersion of light rays. With both sides possessing the same radius of curvature, these lenses are crucial for applications requiring controlled light divergence and dispersion.

BK7 Double Concave Lenses

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Specifications

Lens Type: Bi-Concave
Material: BK7, UVFS, CaF2, ZnSe, H-K9L
Diameter: 3 mm
Focal Length: -6 mm
Edge Thickness, Te: 1 mm
Material: BK7
Design Wavelength: 587.6nm
Diameter Tolerance: +0.0/ -0.1mm
Center Thickness Tolerance: ±0.1mm
Surface Figure: λ/4 @633nm
Focal Length Tolerance: ±1%
Centration: 3 arc min.
Surface Quality: 40/20 -60/40
Bevel: 0.2×45°
Coating: Uncoated or Customized AR

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Features

  • Diverging Optics: Engineered to diverge parallel light, the double concave lens is ideal for applications requiring the dispersion of light beams, such as beam expansion and light projection.
  • Negative Focal Length: Unlike convex lenses, the double concave lens has a negative focal length, enabling it to diverge light rays outside the lens.
  • Uniform Curvature: Both sides of the lens feature the same radius of curvature, ensuring symmetrical light dispersion and consistent optical performance.
  • Broad Spectral Range: Constructed from high-quality BK7 material, these lenses offer excellent transmittance from visible light to near-infrared wavelengths (350-2000nm), providing versatility across various optical setups.
  • Precision Design: Engineered with precise diameter and center thickness tolerances, guaranteeing uniformity and reliability in optical performance.
    Optimized Surface Quality: Features λ/4 surface figure at 633nm, minimizing optical aberrations and ensuring high-quality imaging.
  • Customizable Options: Available in various diameters (Dia), effective focal lengths (EFL), back focal lengths (BFL), center thicknesses (CT), and edge thicknesses (ET), providing flexibility to meet specific application requirements.
  • Coating Options: Offered with optional custom anti-reflective (AR) coatings to enhance light transmission and reduce glare, optimizing performance in different lighting conditions.

Summary:

  • Material: BK7
  • Design Wavelength: 587.6nm
  • Diameter Tolerance: +0.0/-0.1mm
  • Center Thickness Tolerance:  ±0.1mm
  • Surface Figure: λ/4 @633nm
  • Focal Length Tolerance: ±1%
  • Centration: 3 arc min.
  • Surface Quality: 40/20-60/40
  • Bevel: 0.2×45°
  • Coating: Uncoated or Customized AR

Applications

  • Beam Expansion: Utilized to expand the diameter of a light beam in applications such as laser systems, optical instruments, and illumination setups.
  • Light Projection: Applied in projection systems, optical projectors, and imaging devices to control the spread and direction of light beams.
  • Optical Instrumentation: Integrated into optical setups and experimental apparatus for light dispersion, beam shaping, and optical alignment.
  • Scientific Research: Used in laboratories and research facilities for spectroscopy, interferometry, and other optical experiments requiring controlled light dispersion.
  • Industrial Applications: Employed in industrial measurement systems, optical sensors, and laser processing equipment for precise light manipulation and beam control.

Frequently Asked Questions

What is the difference between double concave lenses and plano concave lenses?
Double concave lenses have a negative focal length and can make parallel light diverge outside, while plano concave lenses have a flat surface on one side and a concave surface on the other.
What is the design wavelength of the BK7 double concave lens?
The design wavelength of the BK7 double concave lens is 587.6nm.
What is the diameter tolerance of the BK7 double concave lens?
The diameter tolerance of the BK7 double concave lens is +0.0/-0.1mm.
What is the surface figure of the BK7 double concave lens?
The surface figure of the BK7 double concave lens is λ/4 @633nm.
Can the BK7 double concave lens be coated?
Yes, the BK7 double concave lens can be either uncoated or customized with AR coating.

Got more questions? Use the inquiry form to ask the supplier directly.

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